کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8363967 | 1542596 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Carbon availability regulates soil respiration response to nitrogen and temperature
ترجمه فارسی عنوان
در دسترس بودن کربن، واکنش تنفس خاک به نیتروژن و درجه حرارت را تنظیم می کند
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش خاک شناسی
چکیده انگلیسی
The response of soil CO2 fluxes (Rsoil) to interactions between carbon (C) and nitrogen (N) availability or C and temperature conditions is not well understood, but may increasingly affect future C storage under the combined anthropogenic impacts of N deposition and climate change. Here we addressed this uncertainty through a series of laboratory incubation experiments using soils from three contrasting ecosystems to investigate how changes in C, N, and temperature regulate Rsoil through changes to Michaelis-Menten parameters (i.e. Vmax and Km). Results of this study demonstrate that Rsoil response to N enrichment and changes in temperature are dependent on the C availability of soil substrates. N addition influenced Rsoil through both the maximum rate (Vmax) and the half saturation constant (Km). The increase in Km corresponded to a decrease in Rsoil when C was limited. Alternatively, when C was abundant, N enrichment increased Rsoil, which corresponded to an increase in Vmax. Regulation of temperature sensitivity through Vmax and Km was also dependent on C availability. Both Vmax and Km demonstrated positive temperature responses, supporting the hypothesis of a canceling effect at low C concentrations. While temperature sensitivity was influenced by both C quantity and C complexity, our results suggested that C quantity is a stronger predictor. Despite strong differences in climate, vegetation, and management of our soils, C-N and C-temperature interactions were markedly similar between sites, highlighting the importance of C availability in the regulation of Rsoil and justifying the use of Michaelis-Menten kinetics in biogeochemical modeling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 88, September 2015, Pages 158-164
Journal: Soil Biology and Biochemistry - Volume 88, September 2015, Pages 158-164
نویسندگان
J.R. Eberwein, P.Y. Oikawa, L.A. Allsman, G.D. Jenerette,